Improvement in framing-joints



ICE.

JONAH NEWTON, OE NEW YORK, N. Y.

IMPROVEMENT IN FRAMING-JOINTS.

Specification forming part of Letters Patent No. 116,623, dated July 4, 187i.

To all 'whom it may concern.-

Be it known that I, J ONAH NEWTON, of the city, county, and State of New York, have invented a new and Improved Framing-Joint; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying thawing termin g part of this specification.

rIhis invention relates to a new and improved arrangement of mortises and tenons for framing door-sash and other like frames and cabinet-work together 5 and it consists in a semicircular or nearly semicircnlar mortise and corresponding tenon, the latter made on a greater circle, so as not to ijt the curved wall of the mortise in the bottom closely, the niortise being' made by a circula-r tool, against which the piece to be mortised is moved in a right line, or the tool moved to the piece; or the said mortise, bein iirst made in this form by a circular tool, may be modified by cutting the ends down for about halt', more or less, ot' the depth of the mortise ou a straight oblique line and titting the tenon thereto. The invention also consists in roviding the mortise on the curved wall7 or the partly-curved and partly-oblique walls, with a tongue, and the tenons with a c(lrrespondingl groove to receive the tong-ues. The object ot' the iirst part ot' the invention is to simplify and cheapen the making of the mortise, and to provide an arrangement which will prevent the sagging of the doors when the stiles shrink in width; also, to keep the ,joints tight at the shoulders ofthe tenons; and the object ot' the second part is to provide an arrangement whereby the adhesion ot the parts, when locked together, will be greater, and a greater surface and better condition for the adhesion of the glue will be provided in the parts to be glued.

Figure l a plan view, partly broken, of a( stile and cross-piece joined together by the cir= cular mortise and tenon. Fig. 2 is a section oi' the same on the line r oi' Fig. l. Fig. 3 is an edge view ot' the cross-piece and stile. Fig. 4 is a plan, also partly broken out, showing the mortise and tenon partly curved and partly on straight lines. Fig. 5 is a sectionon the line yy, and Fig. 6 is a section on the line .z z.

Similar letters ot reference indicate corresponding parts.

Gare is taken to so iit the parts that this space.

will be not greater than the greatest amount the mortised part ot' the trame will shrink, so that as it shrinks and draws to 'ard the shoulders, which is insured by gluing' only a short distance from the shoulders, so as to hold the parts firmly there and allow more free movements of the said mortised parts on the tenon at and near the end, the tenon will bear on the curved wall so as to prevent the stile A from sagging, and the joints will not be separated at the shoulder of the tenoned part, as in the case 'of the tenons with parallel edges, passing through the stile and being' wedged thereat, as in the common way, by which they are so bound at the end of the tenon as to compel the stile to shrink away from the shoulders ot' the tenoned piece. The same object may be accomplished to a certain extent by making the end walls ot' the mortise and the edges oi' the tenons on straight lines, converging toward the axial line of the tenon, as indicated at E, Fig'. Li; or this form combined with the circular i'orin may be used, in which case the mortise will 'lirst be cut, as in Fig. l, and the ends atterward out by morti sing-tools on the said oblique lines, the tenons being' shaped to correspond. I also propose, as a further means ot' securing the joints together, to provide the tongue u. on theend and bottom walls of the mortises7 and the groove b in the tenons, for locking the parts together and aiiording more suriacel for gluing the said end and bottom walls and the edges of the tenons together in the parts where they are to be glued, say about one-half the distance trom the shoulders of the tenen and the mouth ot' the mortise toward the bottom. These parts may be so proportioned that they will wedge together very tightly, thereby wedging the tenon in the mortise.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. Theimprovedframngjoiuthereindescribed, 2. The mortise having the tongue a in. the Consisting' of a mortise having the @11d and botcurved orportly-curved and partly-straight Walls, tom Walls formed on it circular line and the edges and the tenou having the groove b therefor, all and end of the teuon shaped to correspond, or substantially as specified. both partly circular and partly straight7 the said JONAH NEVTON. straight parts converging toward the axis ofthe tenon, and the curvature of the tenen being greater than that o1" the mortise, all substantially as speeied.

Titueeses GEO. WV. MABEE, ALEX. F. ROBERTS. 

